When you do a experiment you are testing the chemicals it has molclues
My guess would be so that you can recognize what feels right or wrong and treat others fairly.
By gluing two papers one at the bottom or buy those long papers
I believe it’s D considering the Gettysburg Address came after the battle at Gettysburg which was very gruesome and made the American people unmotivated to continue with the war. He needed everyone to continue to fight for freedom.